importer/viseca: Do not import temporary transactions

Their ID will change once confirmed, confusing the importer

fmt: Traverse directories recursively

Include, not exclude

import: Allow setting account name

Add import and viseca commands, relicense

AGPLv3 required due to the code in `viseca/viseca.go`.

fmt: Add overwriting mode

Heavily inspired by gofmt.go

Add uninstall target, fix man formatting

Initial commit